George a



(No Model.)

G. A. BOYDEN. PUMP GOVERNOR.

No.442,568. Patente-d Dec. 9, 1890.

WITNESSESZ INVENTORI MWhW/W 71- BY @.Mamm

ATTORNEY.

NrTn STATES GEORGE A. BOYDEN, OF BALTIMORE, MARYLAND, ASSIGNOR TO THE BOYDEN BRAKE COMPANY OE BALTIMORE CITY, OF SAME PLACE.

PUMP-GOVERNOR.v

SPECIFICATION forming part of Letters Patent No. 442,568, dated December 9, 1890.

Application filed .Tuly 25, 1890. Serial No. 359,938. (No model.)

T0 all whom. it may concern,.-

` Be it known that I, GEORGE A. BOYDEN, a citizen of the United States, residing at Baltimore, in the State of Maryland, have in- 5 Vented certain new and useful Improvements in Pump-Governors, of which the following is a specification.

My invention relates to improvements in devices for controlling the flow and pressure 1o of fluids; and it consists of a governor that is particularly adapted to control the operation of the air-pump which provides the air-pressurefor railroad-train brakes.

The construction of the device is such that the use of diaphragms is avoided, and the airpressure acting directly under a pop-valve will cause the supply of steam to be cut off, whereby the pump will be stopped when the air has reached the desired pressure and the pump again started by the admission of steam thereto when the air-pressure has been lowered below a predetermined pressure. The governor may also be used for other like purposes.

The devices are hereinafterfully described, reference being had to the accompanying drawing, in which the ligure shows a sectional view of the governor, the section being taken through the vertical axis thereof.

Similar numbers designate similar parts.

The number S denotes the body of the steam throttle-valve, which is in form similar to the globe-valves in common use, and in like manner is connected in the steam-pipe of the pump by suitable unions in such Way that the steam will flow therethrough in the direction indicated by the arrow. A wall 9, which divides the interior of this body into two chambers, having therein the opening 10, that is controlled by the throttle-valve 11, which, when seated upon its seat 12, will close the communication between these two chambers and stop the flow of steam therethrough. This throttle-valve 11 is provided with the valvestem 13, that moves freely in the guide 1t, that is secured to the body of the valve, and is provided with the packing-grooves 36 toA prevent the escape of steam therethrough, the top of this valve-stem being rounded and bearing on the under side of the piston 15,

which is free to move up or down in the cylinder 16, that is made integral with the valvebody 8, this piston 15 being of suflicient depth to form therein the packing-spaces 17, the spring 1S serving to normally hold the piston 55 up to the position shown in the drawing by one end thereof bearing on the under side of the piston and the other end resting on a suitable shoulder formed on the guide 14.

Bolted to the flange 19, With Which the up- 6o per end of the cylinder 16 is provided, is the head 21, that forms a stop to the upward movement of the piston 15, and has therein the valve-chamber 20,that communicates through the port 22 with the air-pressure which is to 65 control the governor. The nipple 23 is made integral with the metal of the cylinder 16 and provided with a union by which the connection is made with a supply-pipe. To control the release of the aiihpressure in the cham- 7o ber 20, the popvalve 24 forms a cover therefor, the knife-edge 26 of which seats upon the valve-seat 26, and its wings 27, moving freely in the chamber 20, serving as a guide therefor. In order to keep this pop-valve 24 on 75 its seat until the desired pressure is obtained thereunder through the port 22, the conical recess 37 is formed in the top thereof,in which rests the corresponding cone point 2S of the loose valve-stem 29, the upper end of this 8o valve-stein moving freely in the recess 30, formed in the adj usting-nut 31, the spring 32, placed under the adjusting-nutand pressing upon the collar of the valve-stem, serving to hold the pop-valve 24 upon its seat 26 With 85 any desired pressure, which pressure may be varied by screwing up or down the adjustingnut 3l, which is threaded to the inner surface of the casing 34, that incloses this part of the governor. rThe cap 38 is threaded to 9c suitthe adjusting-nut 3l,by which thesaid nut is locked in position, a port 35 being provided in the head 2l, whereby communication is established between the chamber formed by the casing 34and that part of thecylinder 16 above 95 the piston l5, and whereby, when the pressure is sufficient to overcome the tension of the spring 32 and raise the pop-valve 24 from its seat, communication will be established through the port 35 to the upper side of the roo piston 15, which is oi such areathat the pressure thereon will overbalance the power eX- crted by the steam-pressure on the under side of the throttle-valve 11, the piston will be moved downward, causing the throttle-valve 'l1 to be brought against its seat, and steam communication shutoff and the pu mp stopped. It will thus .be seen the pop-valve 24 is the controlling valve which governs the action of the throttle or steam valve 1l. When the controlling-pressure in the chamber has been reduced to a point which will permit the pop-valve 24 to be closed thereagainst by the tension of the spring 32, the pressure will be released from the upper side of the piston 15 by the escape lof air past the sides of the piston,which is of a sufficiently loose t for this purpose, and. escape through the opening in the side of the cylinder 16, which is formed therein below the piston 15, the pressure of the steam on the bottom of the throt` ltlc-valve 11 will cause the throttle-valve 11 to be raised from its seat, moving the piston upward to the position shown, and steam will be again admitted to the pump and the pump started to bring the air-pressure up to the required amount.

The port 22 is to be attached to a tank or device in which is held the pressure `that is to control the governor.

I am aware that prior to my invention a diaphragm has been shown carrying a valve; but it has been found in practice that the innumerable vibrations of the diaphragm cause radial formations or ribs therein, and this has the tendency to stiften the diaphragm and render it uncertain in its action. I am also aware that piston-valves have been used; but they are objectionable, owing to the fact that they have to t so neatly that a slight hardening of the oil or corrosion will cause them to stick. This diliiculty is avoided in the present construction by the use of the popvalve, which is free from connection or frictional lcontact with the walls of its chamber and must give under the pressure above and below, there being nothing outside the valve to prevent its action.

Having described my invention and the manner of operating, what I claim, and desire to secure by United States Letters Patent,

The described governor, consisting ot' a throttle-valve 11 and a piston 15 therefor, a supply-passage leading to said piston, and a pop-valve interrupting said passage, held in place by a spring` said pop-valve being free from connection with the walls of its chamber, substantially as described.

In testimony whereof I aflix my signature in the presence of two witnesses.

GEORGE A. BOYDEN. WVitnesses:

J oHN E. MORRIS, JN0. T. MADnoX. 

